Talk to Psychiatry on Anxiousness

I feel so anxious about minor things.i have done MBA from top uni and have done 5 yrs corporate job. Still I feel anxious when I become self-conscious. like if I am walking from somewhere and if there are ppl around me tears come into my eyes. When talking to others, tears come into my eyes. sometimes my head moves involuntarily for some seconds when I am anxious. I feel a sudden rush of blood coming towards my face, and tears come into my eyes and roll down my cheek. if I have to give a small presentation I can not sleep all night. please tell me how can I improve this?